Louis Tomlinson's "Back To You" f/Bebe Rexha (Syco/Epic) is the Most Added song at T40 for a second week in a row, pulling in 37 stations, while Kesha's "Praying" (Kemosabe/RCA) scores 28 more adds and Demi Lovato's "Sorry Not Sorrry" (Hollywood/Island-Republic) stacks 20.